Hi!

I'm hoping someone here will help me out, as my brain has gone in lockdown mode and I can't figure this out.
I'm a rookie at vaping and I purchased a 70/30 basekit with 12MG nicotine (1000ml in total) for my Drag X with 1.2 pnp coil.

So, I figured out, the liquid is way too thick and I need 50/50, and I need more nicotine (18MG instead of 12)

I'm down to about 800ml in the pre-mixed bottle, 70/30 12mg nicotine - What do I need to add, in order to turn it into 50/50 18MG nicotine?